each carat is 200 miligrams
1 carat = 100 cents = 6.5 mm = solitaire
Each diamond is valued according to its cut, clarity, carat weight and colour. Five diamonds weighing one carat, collectively weigh one carat.
Diamonds are weighed in carats, each one carat equaling .20 grammes.
All diamonds -- each with its own carat weight -- are 100 percent diamond.
Given the high number of diamonds limited by the low carat weight in your question, the cost of the diamonds might not be so much a factor as the quality of the setting into which they are mounted. The clarity quality that you describe wouldn't be so visible in diamonds weighing less than a quarter carat (.25 carat) each.
Your total cost depends on the characteristics of each of the diamonds included in the total carat weight: the cut, clarity, colour and carat weight of each.
Apparently, a metric carat, or 0.20 gram, is a standard unit of weight for diamonds and most other gems. Prior to 1913, the French carat and Indian carat and the American carat were all different from each other, confusing the market. In 1913, the metric carat became the standard weight for diamonds and other gem stones. You can read more, below.
Diamonds are graded according to their cut, clarity, carat weight and colour. You can read more about each, below.
You can calculate the total carat weight by adding the individual carat weight of each stone. Without a carat weight of each of your 15 stones, it is not possible to devise a sum total carat weight.
There are 13 diamonds with this name, each detailed below as to a raw stone weight and a finished-cut carat weight.
Usually there is no difference at all. Technically there can be a difference as melle is .25 carat or smaller . Accent diamonds are diamonds that are smaller than the main gem, be it a diamond or other gem. Thus if the center gem is a 20 carat emerald , accent diamonds can be 1 carat each, but this is very very rare. Most of the time they melle and accent are different words for the same thing
Diamonds are valued according to the cut, clarity, colour and carat weight of each stone. A local jeweler can give you the answer you want.